JP2720076B2 - Automatic calibration apparatus for direct sequence spread spectrum receiver - Google Patents

Automatic calibration apparatus for direct sequence spread spectrum receiver

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JP2720076B2
JP2720076B2 JP18413389A JP18413389A JP2720076B2 JP 2720076 B2 JP2720076 B2 JP 2720076B2 JP 18413389 A JP18413389 A JP 18413389A JP 18413389 A JP18413389 A JP 18413389A JP 2720076 B2 JP2720076 B2 JP 2720076B2
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signal
correlator
output
receiver
spread spectrum
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JPH0348540A (en
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正夫 中野
浩 武田
昭彦 遠藤
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京セラ株式会社
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B1/00Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69Spread spectrum techniques
    • H04B1/707Spread spectrum techniques using direct sequence modulation
    • H04B1/7073Synchronisation aspects
    • H04B1/7085Synchronisation aspects using a code tracking loop, e.g. a delay-locked loop

Description

【発明の詳細な説明】 「産業上の利用分野」 本発明は情報信号を含んだ搬送波に拡散符号により変調して広範な帯域にスペクトラム拡散された伝送信号を受信機側において上記送信信号が用いた拡散符号と同一の符号にて受信波の拡散符号に同期させて逆拡散変調をかけて受信信号から原情報信号を得る直接スペクトラム拡散受信機に利用して有用なものであり、特に受信側回路が温度又は経年変化によるドラフトのために特性変動するのを自動的に校正することのできる装置に関する。 Use the transmission signal at the receiver side DETAILED DESCRIPTION OF THE INVENTION transmission signal present invention "relates" it is subjected to a spectrum spread to a wide band modulated by a spreading code in a carrier wave including the information signal using the have spreading code and direct sequence spread spectrum receiver to obtain the original information signal from the received signal by multiplying the inverse spread modulation in synchronization with the spreading code of the received wave at the same reference numerals are those useful, especially the reception side an apparatus capable of circuit is automatically calibrated for characteristic fluctuation due to the draft due to temperature or aging.

「従来の技術」 第2図は従来のスペクトラム拡散方式の受信回路であるが、この回路を構成する回路素子が周囲温度や経年のために特性が変動する所謂ドリフトによって増幅器のゲインや直流電位が変動すると、C点の電位が変動し、相関検出信号S Dにて相関検出が不能となったり、検出すべきでないときに検出信号を出すといった誤検出を生じる。 Figure 2 "prior art" is a reception circuit of a conventional spread spectrum, but the gain and DC potential of the amplifier by a so-called drift where circuit elements constituting the circuit to change properties for ambient temperature and aging is when varying the potential of the point C is changed, or becomes impossible correlation detected by the correlation detection signal S D, resulting in erroneous detection such issues a detection signal when it should not be detected. 更に正確に検出された場合であっても作動増幅器60 Furthermore even if correctly detected operating amplifier 60
に入力される検波器51,52の出力にオフセット電圧、又は利得差が現われて、そのために遅延ロックループのロック点がずれてしまうといった欠点を包蔵している。 Offset voltage at the output of the detector 51 to be input, or gain difference appear, and occluded the disadvantage deviates lock point of the delay locked loop to its being in.

第3図は受信波に含まれる拡散符号信号と受信機内で発生させる擬似雑音符号信号の位相差と相関出力の関係を示すグラフであって、同図(A)はドリフトによる変動のない理想的な場合の相関検出点a,b及び差動増幅器6 Figure 3 is a graph showing the relationship between the correlation output and the phase difference between pseudo-noise code signal generated in the receiver and the spreading code signal included in the received wave, Fig (A) ideally without fluctuations due to drift correlation detection point a when a, b and a differential amplifier 6
0の出力の関係にあることを表わしている。 Indicates that at the output of the relation of 0. 次に相関出力b点でドリフトによる変動があると、位相にずれが生じて同図(B)(C)のように夫々追跡点Fが位相遅れ側でレベルの高低いずれかに狂いを生ずる。 Now there are variations due to drift in the correlation output point b, resulting in deviation in the respective tracking point F is one level of high and low in the phase lag side as in FIG shifted in phase occurs (B) (C).

「発明が解決しようとする問題点」 本発明は前記の温度ドリフト、経年変化等の対策として温度補償回路や特殊部品を使用することによって、回路の複雑化やコスト上昇を回避することを目的として同期検出及び同期保持回路を重視して、これを自動的に校正せんとするにある。 "INVENTION AND SUMMARY Problems" The present invention is the temperature drift, by using a temperature compensation circuit and special parts as a countermeasure against the aged deterioration, for the purpose of avoiding the complexity and cost increase of the circuit It emphasizes sync detection and synchronization holding circuit is to automatically calibrate cents this.

「問題点を解決するための手段」 しかして本発明は、従来の相関器の入力側に受信モードと校正モードに切換えるスイッチ手段を設け、擬似雑音発生器の出力信号を1/2,1,3チップ遅延させて受信信号に乗算,検波,加算する遅延ロックループ中に設けた "Means for solving the problem" Thus the present invention, a switching means for switching to receive mode and calibration mode the input side of a conventional correlator is provided, a pseudo noise generator of the output signal 1/2, 1, 3 multiplies the received signals by the chip delay detection, provided during the delay locked loop for adding
CPUにより制御する自動校正装置とするものである。 It is an automatic calibration apparatus for controlling the CPU.

以下に第1図により本発明の一実施例について説明する。 An embodiment of the present invention will be described by Figure 1 below.

「実施例」 第1図は本発明のスペクトラム拡散受信機に対して自動校正手段を施した回路構成図であり、第2図と同一の対応部には同一符号を付してある。 "Examples" FIG. 1 is a circuit configuration diagram which has been subjected to automatic calibration means with respect to a spread spectrum receiver of the present invention, the same corresponding portion and the second drawing are denoted by the same reference numerals.

先づアンテナANTにより受信された信号は、RF増幅器1に入来し、受信モード接点Rxと校正モード接点Rc間を Previously Dzu signal received by the antenna ANT is to incoming to the RF amplifier 1, the reception mode contact Rx between calibration mode contacts Rc
CPU17の指令によって切換えられるスイッチ70を経て増幅器21,22,23,乗算器31,32,33,相関フィルタ41,42,43, Amplifiers 21, 22 and 23 via a switch 70 which is switched by a command of CPU 17, the multiplier 31, 32, 33, the correlation filter 41, 42, 43,
検波器51,52,53、差動増幅器60並びに比較器61からなる相関器2の入力に加えられる。 Detector 51, 52, 53, applied to the input of the correlator 2 to a differential amplifier 60 and comparator 61.

20はA/Dコンバータ、30,40は夫夫D/Aコンバータ、8 20 A / D converter, 30 and 40 severally D / A converter, 8
はVCO(電圧制御発振器)、9は擬似雑音発生器、10はシフトレジスタであり、9よりの擬似雑音信号を0,1/2, The VCO (voltage controlled oscillator) 9 pseudo noise generator, 10 is a shift register, a pseudo-noise signal 0, 1/2 of from 9,
1,2チップ遅延させた信号を得ている。 1,2 is obtained a signal obtained by chip delay. 11,12は減衰器、 11 and 12 attenuator,
13は加算器、14は乗算器、15はBPF(帯域通過フィルタ)、16は受信周波数と同一周波数を送出する発振器である。 13 an adder, 14 multiplier, 15 BPF (bandpass filter), 16 is an oscillator for transmitting a reception frequency and the same frequency.

今、スイッチ70がCPUの指令により校正モードに選択切換えされたとすると、発振器16はアンテナに入来する受信周波数と同一の周波数を発振し乗算器14に加えられる。 Now, when the switch 70 is with the selected switched to the calibration mode by a command CPU, an oscillator 16 is applied to the multiplier 14 oscillates the same frequency as the reception frequency coming to the antenna.

一方、擬似雑音信号発生器9からシフトレジスタ10に対しPN信号が加えられ、1/2チップ及び3チップ遅延させた信号を減衰器12により減衰させて加算器13に加え更に乗算器14によって平衡変調即ちスペクトラム拡散変調される。 On the other hand, with respect to the shift register 10 from the pseudo noise signal generator 9 PN signal is applied, equilibrated with 1/2-chip and 3 chip the delayed signal is attenuated by the attenuator 12 adder 13 in addition further multiplier 14 is modulated that is spread-spectrum modulation. そこでBPF15により不要帯域を除去し校正接点R So removing the unnecessary band by BPF15 calibration contacts R
cを経て相関器の入力に受信信号を模擬したものとして加える。 Through c added as simulating the received signal to the input of the correlator.

そして上記相関器に入力した模擬信号が増幅された後、乗算器31,32,33に夫夫加わると、これら乗算器に前記シフトレジスタの各段から1/2,1,3チップずれた信号が加えられており、上記PN信号とN−1/2とが上記乗算器に加えられることになって、同一拡散符号且つビット,フレームとも同期が得られているので、上記乗算器において逆拡散され相関フィルタを経て検波器により検波されて直流電圧がC点に得られる。 Then, after the simulation signal input to the correlator is amplified and applied severally to the multiplier 31, 32, 33 from each stage of the shift register to the multipliers 1 / 2,1,3 chip shifted signal has been added, so that the PN signal and the N-1/2 is applied to the multiplier, the same spread code and bits, since the frame with synchronization is obtained, the despreading in the multiplier It is is detected by a detector via a correlation filter DC voltage is obtained in C point.

また擬似雑音信号のN−3の成分は乗算器において発振器16の出力信号と乗算されるが、N−3とN−1/2とでは2.5チップ同期がずれているので逆拡散することはない。 Although components of the N-3 of the pseudo-noise signal is multiplied output signal of the oscillator 16 and the multiplier, no despreading since between N-3 and N-1/2 are shifted 2.5 chip synchronization .

一般に異なる符号列及び同一符号列でも1チップ以上、同期がずれていれば相関出力が零つまり無相関であるので、前記乗算器に上記シフトレジスタよりのN−1/ Generally different code sequences and one or more chips in the same code sequence, the correlation output if the synchronization deviation is zero i.e. uncorrelated, than the shift register to the multiplier N-1 /
2の符号と、擬似雑音信号のN−3とは無相関であり、 And second code are uncorrelated and N-3 of the pseudo-noise signal,
N−3はN−1/2にとっては受信信号N−1/2に雑音成分N−3を加算した信号になっている。 N-3 has become the sum of the noise component N-3 to the received signal N-1/2 signal for the N-1/2.

受信機の受波信号成分には熱雑音が加算されていて、 The received signal component of the receiver have been added thermal noise,
信号成分N−1/2と雑音成分N−3の信号レベルが減衰器によって受信機の受信条件と合致するように設定するので、この模擬信号は将にアンテナにより受波する受信信号を規模したものとなっている。 Since the signal component N-1/2 and the noise component N-3 of the signal level is set to match the reception condition of the receiver by the attenuator, the test signal was scale the received signal for reception by antenna Masaru It has become a thing.

次に校正モードにおいては、前記の通り模擬信号は必らず受信しうる条件にあるから、差動増幅器60の出力電圧をA/Dコンバータ20を介してCPU内のメモリに記憶させておき、相関器内の相関検出する比較器の出力が反転するようにその基準電圧入力側にD/Aコンバータ40を介してCPUが指令を出し、D/Aコンバータのバイナリ値を上記のメモリに記憶する。 Then at the calibration mode, as the simulation signal of said because there in conditions that may receive 必 Raz, is stored in the memory in the CPU the output voltage of the differential amplifier 60 via an A / D converter 20, to the reference voltage input so that the output of the comparator for correlation detection in the correlator is reversed through the D / a converter 40 CPU issues an instruction to store the binary value of the D / a converter to the memory .

なおスイッチ70を受信モードに切換えたときに受信信号がアンテナから入来して検波器53に直流出力電圧が現われると、前記した校正作用によってD/Aコンバータ40 Note the received signal when switching the switch 70 to the receive mode and coming from the antenna DC output voltage appears at the detector 53, D / A converter by calibration action described above 40
が適切に補正された信号電圧に調整されているため誤動作は起らない。 Malfunction does not occur because is adjusted appropriately corrected signal voltage. また相関検出後に同期保持するためにVC The VC to hold synchronized after correlation detection
O8の出力周波数を制御し、前記差動増幅器60の出力電圧つまりA/Dコンバータ20のバイナリ値を校正モード時に記憶している電圧値と同一電圧になるように、CPUがD/A Controlling the output frequency of O8, the differential amplifier 60 the output voltage to be the voltage value of the same voltage which stores a binary value to the calibration mode of clogging the A / D converter 20, CPU is D / A
コンバータ30に対して指令することにより、遅延ロックループが制御される。 By command to the converter 30, a delay locked loop is controlled.

前記の校正作用を例えば電源投入の都度実施できるようにすれば、回路部品特性の経年変化による影響を浮けることがなくなり、受信機内に設けた温度センサの設定範囲を逸脱する可能性を予知して校正作用を発揮せしめるように、CPUにプログラムを組んでおくことによって本発明を実施することができる。 If the calibration action of the so can be implemented for example every time the power is turned on, prevents affected by aging of circuit components characteristics, foresee the possibility of deviating from the set range of the temperature sensor provided in the receiver as allowed to exert calibration action Te, it is possible to practice the present invention by keeping formed a program to the CPU.

「効 果」 かくて本発明によれば、従来の相関器から同期保持信号と、受信機の受波信号に擬似の雑音信号との同期検波出力を入力とし、上記同期検波出力の補正と上記擬似雑音信号発生のためとに指令を送出するCPUを利用し、RF According to the present invention Te write "effect", the synchronization hold signal from a conventional correlator, as an input synchronous detection output of the noise signal of the pseudo the received signal of the receiver, the synchronous detection output of the correction and the utilizing the CPU for sending a command to the order of the pseudo-noise signal generator, RF
増幅器の後段に上記CPUの指令により通常の受信モードと校正モードとに切換えられるスイッチ手段と、上記擬似雑音信号発生器の出力に遅延をかけた拡散符号を有する受信周波数に擬似の周波数を減衰させる手段とを付加するだけで、上記スイッチ手段に至る遅延ループを形成することにより、受信波の有する拡散符号に対する同期検波及び同期保持に確実且つ高精度の校正機能を発揮せしめることができる。 Switch means is switched by a command of the CPU in a subsequent stage of the amplifier to the normal reception mode and the calibration mode, attenuating the frequency of the pseudo the reception frequency with a spread code obtained by multiplying a delay to the output of the pseudo-noise signal generator simply adding means, by forming a delay loop leading to said switch means, it can be allowed to exert a calibration function reliably and accurately to the synchronous detection and synchronization holding against the spreading code having the received wave.

【図面の簡単な説明】 BRIEF DESCRIPTION OF THE DRAWINGS

第1図は本発明の直接スペクトラム拡散受信機の自動校正装置を表わす回路構成図、第2図は従来のスペクトラム拡散符号化信号の受信機における相関器の回路構成図、第3図は相関器内の差動増幅器の入力波の位相と出力との関係を説明するためのグラフである。 Figure 1 is a circuit configuration diagram showing an automatic calibration apparatus for direct sequence spread spectrum receiver of the present invention, Figure 2 is the circuit diagram of the correlator in the receiver of the conventional spread spectrum coded signal, Figure 3 is a correlator is a graph illustrating the relationship between the phase and the output of the input wave of the differential amplifier of the inner. 1……RF増幅器、2……相関器、21,22,23……増幅器、 1 ...... RF amplifier, 2 ...... correlators, 21, 22, 23 ...... amplifier,
31,32,33……乗算器、41,42,43……相関フイルタ、51,5 31, 32, 33 ...... multiplier, 41, 42, 43 ...... correlation filter, 51,5
2,53……検波器、60……差動増幅器、61……比較器、20 2, 53 ...... detector, 60 ...... differential amplifier, 61 ...... comparator, 20
……A/Dコンバータ、30,40……D/Aコンバータ、8……V ...... A / D converter, 30,40 ...... D / A converter, 8 ...... V
CO、9……擬似雑音信号の発生器、10……シフトレジスタ、11,12……減衰器、13……加算器、14……乗算器、1 CO, 9 ...... pseudo-noise signal generator, 10 ...... shift register, 11, 12 ...... attenuator, 13 ...... adder, 14 ...... multiplier, 1
5……BPF、16……発振器、17……CPU、70……スイッチ手段。 5 ...... BPF, 16 ...... oscillator, 17 ...... CPU, 70 ...... switch means.

Claims (1)

    (57)【特許請求の範囲】 (57) [the claims]
  1. 【請求項1】情報信号に広帯域の拡散符号を乗算して送信し、これを受信側が逆拡散することにより、狭帯域信号に復元する直接スペクトラム拡散通信方式の受信機において、A/D変換した相関器の同期保持信号と、受信機の受信信号及び擬似雑音信号の同期検出信号とが入力され、上記相関器に対して校正モード時にD/A変換器を介して加える上記同期検出信号のスレッショルド電圧を補正するための指令と、D/A変換器を介してVCOの出力周波数の制御と、上記相関器への信号入力をアンテナからの受信信号のRF増幅器出力段で受信モード及び上記校正モードに切換えるスイッチ手段への指令とを発するCPUを備え、上記擬似雑音信号の発生器の出力信号から1/2,1, 1. A transmitted by multiplying the wideband spread code information signal, it is the receiving side by despreading, the receiver of the direct spread spectrum communication system to be restored to the narrow band signal, and A / D conversion a synchronization hold signal of the correlator, the synchronization detection signal of the received signal and the pseudo noise signal of the receiver is input, the threshold of the sync detection signal applied via the D / a converter to the calibration mode to said correlator a command for correcting the voltage, D / a converter and control of the output frequency of the VCO via a receive mode and the calibration mode in the RF amplifier output stage of the received signal from the antenna signals input to the correlator switch includes a CPU which issues a command to the unit, the pseudo-noise signal 1 / 2,1 from the output signal of the generator to switch to,
    3チップ遅延させる複数段のシフトレジスタと、上記夫夫遅延させた擬似雑音信号を上記相関器内の乗算器に加えるとともに、上記1/2及び3チップの遅延した擬似雑音信号が夫夫別個に加えられる減衰器と、各減衰器の出力を加算後に受信周波数と同一の周波数を送出する発振器の出力周波数とともに加えられる乗算器とより成り、 3 and the shift register of a plurality of stages to be chip delay, a pseudo noise signal obtained by the severally delay with added to the multiplier in the correlator, the pseudo noise signal delayed in the 1/2 and 3 chips severally separately become more and attenuator applied, with each attenuator output multiplier applied together with the output frequency of the oscillator delivering the same frequency as the reception frequency after the addition,
    上記スイッチ手段の校正端子に至る制御ループにより同期検波信号並びに同期保持信号を制御することを特徴とした直接スペクトラム拡散受信機の自動校正装置。 Automatic calibration apparatus for direct sequence spread spectrum receiver is characterized in that controlling the synchronous detection signal and the synchronization hold signal by a control loop leading to the calibration terminal of the switch means.
JP18413389A 1989-07-17 1989-07-17 Automatic calibration apparatus for direct sequence spread spectrum receiver Expired - Fee Related JP2720076B2 (en)

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JP18413389A JP2720076B2 (en) 1989-07-17 1989-07-17 Automatic calibration apparatus for direct sequence spread spectrum receiver
US07/604,988 US5029181A (en) 1989-07-17 1990-10-25 Automatic calibration device for direct spectrum spread receiver

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